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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9597af431babb860e30bd8602b0da0a829cd462eda3f61d303c4e03f47e57518' 
  AND token = '7MwCjpb4HrPC63AzKfVKdwAs796f8Jck/1MM4P9+sVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}